The Poplar Watershed (HUC 10060003) spans across northeastern Montana and southern Saskatchewan, covering a land area of approximately 1,146 square miles. The hydrology of the watershed is predominantly characterized by the Poplar River and its tributaries, which drain into the Missouri River. The watershed experiences cold, snowy winters with an average annual snowfall of around 50 inches. The snowpack in the higher elevations of the watershed plays a vital role in providing a significant portion of the surface water during the dry summer months. Surface water quality in the watershed is generally good, with low levels of total dissolved solids, nitrates, and phosphates. The primary reservoirs in the watershed are the Fort Peck and Fresno Reservoirs, which are important sources of irrigation water for the region's agriculture industry. In recent years, the watershed has experienced significant trends in precipitation and temperature patterns, including more frequent and severe droughts and increased temperatures during the summer months. These shifts in climate have the potential to impact the hydrology and ecology of the watershed, as well as the region's agricultural and recreational activities.